So, I've had 5 random reboots so far today, including one that happened less than 10 minutes after I finally allowed my Arc to update to its latest Jelly Bean version (build no. JRO03L773, kernel 3.0.31, build@kb-bd-lin32-001 #1, May 7th)

Anyone else been getting them lately? :/

EDIT: Random reboot number 6...

EDIT 2: And that seems to be the last one. For now. Hasn't spontaneously rebooted yet today, though nothing on my system changed.

...and now they're back. This time with the added bonus of it sometimes staying on the colored "koboarc" splash screen for nearly a minute before switching to the confetti stream animation.

Hmm. Starting to think it's might be Twitter's fault - I normally have it up, even when the Arc's idle (which is when most of the reboots have happened). One of the reboots was while I was in Google Currents (but Twitter was in the background) and two of the others when trying to refresh Twitter.

EDIT: Reboot 2... (9:20am)
EDIT: Reboot 3... (9:26am)
EDIT: Reboot 4... (11:15am; this time Twitter wasn't even active, at least not on the multitasking list)
EDIT: Reboot 5... (3:40pm; had it off for a couple of hours while out, so uptime about an hour and it rebooted when I was swiping away Twitter)

EDIT: As for using logcat, I've no idea how to get the SDK up and running (and the Arc recognized properly) to be able to start running adb commands... :/

I have started having this problem within the last week or so, and it is getting worse each day! I've tried clearing the cache (power off/volume), and it has not helped. I've checked for updates and it says there are none. I'm at a total loss as to how to fix this, or what went wrong to begin with.

I think I'm down to a factory reset, which I hate doing as I have customized my arc (different launcher, etc) quite a bit.

Anyone have any suggestions as to how to correct it, or what might suddenly be causing it?